98.6x98.6-98.5x98.7的简便运算
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98.6x98.6-98.5x98.7
=98.6x98.6-(98.6-0.1)x(98.6+0.1)
=98.6x98.6-(98.6x98.6-0.1×0.1)
=98.6x98.6-98.6x98.6+0.01
=0.01
=98.6x98.6-(98.6-0.1)x(98.6+0.1)
=98.6x98.6-(98.6x98.6-0.1×0.1)
=98.6x98.6-98.6x98.6+0.01
=0.01
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